Defensive tackle Tank Carradine relished his first game since tearing his right knee’s anterior cruciate ligament Nov. 24 at Florida State.

And Carradine was shocked to play three times as many snaps as he expected (60 instead of 20), made necessary by the defensive line’s attrition to injuries.

“I realize I’ve got to get in better shape and that will come along,” said Carradine, a 2013 second-round pick who did not play as a rookie while rehabilitating his knee. “I was a little nervous because people expect this and that.”

Carradine had eight tackles and a first-quarter sack. How did he plan on spending Friday’s day off? “In an ice-cold tub,” Carradine said.

Here is how snaps were split among the 49ers in Thursday’s 23-3 exhibition-opening loss at Baltimore: